Evaluation of Aggregate Stability Using the Slaking Index Method with Soil Physical Approach in Keduang Sub-Watershed, Indonesia

Yıl 2024, , 246 - 262, 30.06.2024

Nanda Mei Istiqomah , Ongko Cahyono , Mujiyo Mujiyo , Dwı Prıyo Arıyanto

https://doi.org/10.29133/yyutbd.1407811

Öz

The Keduang Sub-Watershed area has faced multiple natural disasters like landslides, erosion, and flooding because of the poorly managed terrain in the area. This study examines the distribution of the slaking index on agricultural land in the Keduang Sub-Watershed, analyzes the impact of soil type on it, and identifies the soil physical elements that have the most significant influence on it. The study took place in the Keduang Sub-Watershed, Indonesia, utilizing agricultural land from woods, plantations, drylands, and paddy fields with Andisols, Alfisols, Inceptisols, and Entisols soil types. This survey research was supported by laboratory analysis of the soil's physical and chemical properties and used GIS for data interpretation. Soil samples were collected from 22 Land Map Units (LMUs) with 3 replications each, resulting in 66 samples. The SLAKES software assesses the primary parameter, the slaking index. The supporting parameters analyzed were aggregate stability, bulk density, texture, structure, pH, organic C, and Cation Exchange Capacity (CEC). The research showed that soil types in the Keduang Sub-Watershed significantly affect the slaking index value. The slaking index ranged from 0.13-11.63, with the highest values for Andisols in a forest, while the lowest values were Inceptisols in a plantation. The allophane mineral in Andisols was causing the high slaking index. The soil factors determining the slaking index were bulk density and exchangeable K. The lower the bulk density, the higher the slaking index. Meanwhile, the lower the exchangeable K, the lower the slaking index. The land management recommendations based on determinant factors are adding organic material and reducing soil cultivation practices.

Anahtar Kelimeler

Aggregate Stability, Erosion, Slaking index, Soil degradation, Watershed

Kaynakça

• Aisy, R., Sukmono, A., & Firdaus, H. S. (2023). Analysis of Changes in Erosion Rates in the Keduang Sub-Watershed 2016-2021 using the Universal Soil Loss Equation (USLE) Method. Jurnal Geodesi Undip, 12(2), 111–120. https://doi.org/10.14710/jgundip.2023.38065 (in Indonesian)
• Alaboz, P., Dengiz, O., Pacci, S., Demir, S., & Türkay, C. (2022). Determination of the Effect of Different Organic Fertilizers Applications on Soil Quality Using the SMAF Model. Yuzuncu Yil University Journal of Agricultural Sciences, 32(1), 21-32. doi:10.29133/yyutbd.1015943
• Almajmaie, A., Hardie, M., Doyle, R., Birch, C., & Acuna, T. (2017). Influence of Soil Properties on The Aggregate Stability of Cultivated Sandy Clay Loams. Journal of Soils and Sediments, 17(3), 800–809. https://doi.org/10.1007/s11368-016-1568-1
• Bilias, F., Kotsangeli, E., Ipsilantis, I., & Barbayiannis, N. (2022). Cation Exchange Resins for Predicting Available K on K-Deficient Soils: Extraction Capacity among Different Soil K Pools and First Insights on the Contribution of K Solubilized by Rhizosphere Microbes. Land, 11(2146), 1-13. https://doi.org/10.3390/land11122146
• Brar, B. S., Singh, J., Singh, G., & Kaur, G. (2015). Effects of Long Term Application of İnorganic and Organic Fertilizers on Soil Organic Carbon and Physical Properties in Maize-Wheat Rotation. Agronomy, 5(2), 220–238. https://doi.org/10.3390/agronomy5020220
• Cahyono, O., Minardi, S., Hartati, S., Widijanto, H., Adikusumo, I., & Ramadhani, R. N. S. (2023). Improvement of Phosphorus and Dolomite Fertilization Methods on Cayenne Pepper (Capsicum frutescens L.) in Alfisols. International Journal of Agricultural Technology, 19(4), 1469–1484. http://www.ijat-aatsea.com
• Center for Research and Development of Agricultural Land Resources. (2009). Chemical Analysis of Soil, Plants, Water, and Fertilizer. Bogor: BBSDLP (in Indonesian)
• Center for Research and Development of Agricultural Land Resources. (2022). Soil Physical Properties
• and Methods of Analysis. Bogor: BBSDLP (in Indonesian)
• Central Bureau of Statistics Wonogiri Regency. (2021). Number of Villages/Subdistricts Affected by Natural Disasters 2018-2020. https://wonogirikab.bps.go.id/indicator/154/166/1/bencana-alam.html (in Indonesian)
• Dadgar, M. (2018). The Effect of Land Types and Consequently Land Use on Soil Organic Carbon Content – Case Study: Damavand Region of Iran. Applied Ecology and Environmental Research, 16(5), 5815–5824. https://doi.org/10.15666/aeer/1605_58155824
• Dewi, W. S., Purwanto, S., Rahmadani, A. D., Pranata, W. G., & Herdiansyah, G. (2023). Land Suitability Evaluation for Curcuma zedoaria Rosc. in the Community Forest of the Upstream Bengawan Solo Watershed, Wonogiri, Indonesia. Journal of Degraded and Mining Lands Management, 10(3), 4369–4377. https://doi.org/10.15243/jdmlm.2023.103.4369
• Dewi, W. S., Puspaningrum, A., Tinuntun, R. S. T., Suntoro, S., & Mujiyo, M. (2022). A Modified Soil Fertility Assessment Method Using Earthworm Density and Microbial Biomass C at Various Land Uses in Wonogiri, Indonesia. International Journal of Design and Nature and Ecodynamics, 17(6), 929–936. https://doi.org/10.18280/ijdne.170614
• Eleftheriadis, A., Lafuente, F., & Turrión, M. B. (2018). Effect of Land Use, Time Since Deforestation and Management on Organic C and N in Soil Textural Fractions. Soil and Tillage Research, 183, 1–7. https://doi.org/10.1016/j.still.2018.05.012
• Fajardo, M., & McBratney, A. (2019). Slakes: A soil aggregate stability smart-phone app [Mobile application software]. The University of Sydney, Australia. Retrieved from https://play.google.com/store/apps/details?id=slaker.sydneyuni.au.com.slaker&hl=en.
• Fajardo, M., McBratney, A. B., Field, D. J., & Minasny, B. (2016). Soil Slaking Assessment Using İmage Recognition. Soil and Tillage Research, 163, 119–129. https://doi.org/10.1016/j.still.2016.05.018
• Farrasati, R., Pradiko, I., Rahutomo, S., Sutarta, E. S., Santoso, H., & Hidayat, F. (2019). Soil Organic Carbon in North Sumatra Oil Palm Plantation: Status and Relation to Some Soil Chemical Properties. Jurnal Tanh Dan Iklim, 43(2), 157–165. (in Indonesian)
• Fitria, L., & Soemarno. (2022). Effects of Lime and Compost on Chemical Characteristics and Soil Hydraulic Conductivity of Alfisols at ATP Jatikerto Coffee Plantation. Caraka Tani: Journal of Sustainable Agriculture, 37(1), 48–61. https://doi.org/10.20961/carakatani.v37i1.54010
• Gautam, T. P., & Shakoor, A. (2016). Comparing the Slaking of Clay-Bearing Rocks Under Laboratory Conditions to Slaking Under Natural Climatic Conditions. Rock Mechanics and Rock Engineering, 49(1), 19–31. https://doi.org/10.1007/s00603-015-0729-7
• Gong, H., Meng, D., Li, X., & Zhu, F. (2013). Soil Degradation and Food Security Coupled with Global Climate Change in Northeastern China. Chinese Geographical Science, 23(5), 562–573. https://doi.org/10.1007/s11769-013-0626-5
• Gu, W., Zhang, W., Xiu, L., Sun, Y., Wu, D., Wang, Y., Zhang, H., Yuan, H., Feng, Z., Meng, J., & Chen, W. (2023). Soil Aggregate Variation in Two Contrasting Rice Straw Recycling Systems for Paddy Soil Amendment Over Two Years. Archives of Agronomy and Soil Science, 69(14), 3044–3059. https://doi.org/10.1080/03650340.2023.2196618
• Hanifa, H., & Suwardi. (2022). The Value of Soil Erodibility on Various Landuse and Slopes in Tulis Sub-Watershed, Banjarnegara, Center Java. Jurnal Ilmiah Pertanian, 18(2), 160–165. https://jurnal.unikal.ac.id/index.php/biofarm/article/download/2449/1400
• Hartono, Iqbal, & Daniel. (2018). Performance Test of Organic Fertilizer Applicators and the Effect of Organic Materials on Soil Physical Properties and Melon Plant (Cucumis melo L.) Growth. Jurnal AgriTechno, 11(1), 59–66. https://agritech.unhas.ac.id/ojs/index.php/at/article/download/88/78
• Henry, A., Mabit, L., Jaramillo, R. E., Cartagena, Y., & Lynch, J. P. (2013). Land Use Effects on Erosion and Carbon Storage of The Río Chimbo Watershed, Ecuador. Plant and Soil, 367(1–2), 477–491. https://doi.org/10.1007/s11104-012-1478-y
• Husain, A., Baderan, N., & Purnomo, S. H. (2022). Growth and Yield of Local Corn Plants of the Motorokiki Variety on Several Slope Classes and NPK Fertilizer Dosages in Payu, Gorontalo. Jurnal Tanah Dan Sumberdaya Lahan, 9(2), 223–230. https://doi.org/10.21776/ub.jtsl.2022.009.2.3 (in Indonesian)
• Indonesian Center for Agricultural Land Resources Research and Development (ICALRD). (2020). Portal PPID Kementerian Pertanian RI. Retrieved from https://bbsdlp-litbang-ppid.pertanian.go.id/doc/32/LAPORAN%20TAHUNAN/Laptah%20Litbang%202020%20(BBSDLP)_270121.pdf
• Istiqomah, N. M., Cahyono, O., Mujiyo, M., Ariyanto, D. P., Maro’Ah, S., Romadhon, M. R., & Irmawati, V. (2023). Assessment of Potential Soil Degradation on Various Land Uses in Keduang Watershed. IOP Conference Series: Earth and Environmental Science, 1241(1). https://doi.org/10.1088/1755-1315/1241/1/012014
• Jones, E. J., Filippi, P., Wittig, R., Fajardo, M., Pino, V., & Mcbratney, A. B. (2021). Mapping Soil Slaking İndex and Assessing the İmpact of Management in a Mixed Agricultural Landscape. SOIL, 7(1), 33–46. https://doi.org/10.5194/soil-7-33-2021
• Juarti. (2016). Analysis of Andisol Soil Quality Index on Various Land Uses in Sumber Brantas Village, Batu City. Jurnal Pendidikan Geografi, 21(2), 58–71. (in Indonesian)
• Karahan, G., & Yalım, Y. Ş. (2022). Evaluation of the Relationship Between Infiltration Rate and Some Soil Properties under Different Land-Use. Yuzuncu Yil University Journal of Agricultural Sciences, 32(3), 623-634. https://doi.org/10.29133/yyutbd.1130123
• Karanganyar Regency Government. (2021). Karanganyar Regency Natural Disaster Recap. Retrieved from https://data.go.id/dataset?kategori=&q=bencana%20kabupaten%20karanganyar (in Indonesian)
• Kurniawan, I. D., Kinasih, I., Akbar, R. T. M., Chaidir, L., Iqbal, S., Pamungkas, B., & Imanudin, Z. (2023). Arthropod Community Structure Indicating Soil Quality Recovery in the Organic Agroecosystem of Mount Ciremai National Park’s Buffer Zone. Caraka Tani: Journal of Sustainable Agriculture, 38(2), 229–243. https://doi.org/10.20961/carakatani.v38i2.69384
• Li, S., He, H., Tao, Q., Zhu, J., Tan, W., Ji, S., Yang, Y., & Zhang, C. (2020). Kaolinization of 2:1 Type Clay Minerals with Different Swelling Properties. American Mineralogist, 105(5), 687–696. https://doi.org/doi:10.2138/am-2020-7339
• Limbong, W. M. M., Sabrina, T., & Lubis, A. (2017). Alteration of Paddy Soil Physical Properties Planting with Watermelon Through the Application of Organic Materials. Jurnal Agroekoteknologi FP USU, 5(1), 152–158. https://talenta.usu.ac.id/joa/article/download/2333/1719 (in Indonesian)
• Liu, Y., Liu, G., Xiao, H., Dan, C., Shu, C., Han, Y., Zhang, Q., Guo, Z., & Zhang, Y. (2023). Predicting the İnterrill Erosion Rate on Hillslopes İncorporating Soil Aggregate Stability on the Loess Plateau of China. Journal of Hydrology, 622(129698), 1-10. https://doi.org/10.1016/j.jhydrol.2023.129698
• Mamta, Shambhavi, S., Kumar, R., Bairwa, R., Meena, P., & Meena, M. C. (2023). Assessment of Carbon Pools and Stability of Soil Aggregates in Inceptisols of Indo-Gangetic Plains as Influenced by Seven-Year Continuous Tillage Practices Under Maize-Based Cropping System. Communications in Soil Science and Plant Analysis, 54(4), 544–558. https://doi.org/10.1080/00103624.2022.2118298
• Meilani, R. P., Putra, E. T. S., & Indradewa, D. (2023). Macronutrient Contents and Yield of Cocoa Resulting from Two Different Rejuvenation Techniques. Caraka Tani: Journal of Sustainable Agriculture, 38(2), 387–403. https://doi.org/10.20961/carakatani.v38i2.57674
• Minister of Environment. (2009). Guidelines for Mapping and Determining Level of Soil Degradation on Biomass Production (in Indonesian)
• Mujiyo, Hardian, T., Widijanto, H., & Herawati, A. (2021). Effects of Land Use on Soil Degradation in Giriwoyo, Wonogiri, Indonesia. Journal of Degraded and Mining Lands Management, 9(1), 3063–3072. https://doi.org/10.15243/JDMLM.2021.091.3063
• Mujiyo, Hardian, T., Widijanto, H., & Herawati, A. (2022). Assessment of Soil Degradation Potency for Biomass Production and the Strategy for its Management in Giriwoyo-Indonesia. IOP Conference Series: Earth and Environmental Science, 986(1). https://doi.org/10.1088/1755-1315/986/1/012036
• Mujiyo, M., Naaifah, M. I., Suntoro, S., & Maro’ah, S. M. (2023). A Comparative Study of Soil Fertility in Organic, Semi-Organic, and Conventional Rice Field Farming Systems (Case Study: Nguntoronadi District, Wonogiri, Indonesia). Yuzuncu Yil University Journal of Agricultural Sciences, 34(1), 44-61.https://doi.org/10.29133/yyutbd.1357044
• Nciizah, A. D., & Wakindiki, I. I. C. (2015). Physical Indicators of Soil Erosion, Aggregate Stability and Erodibility. Archives of Agronomy and Soil Science, 61(6), 827–842. https://doi.org/10.1080/03650340.2014.956660
• Neris, J., Tejedor, M., Rodríguez, M., Fuentes, J., & Jiménez, C. (2013). Effect of Forest Floor Characteristics on Water Repellency, İnfiltration, Runoff and Soil Loss in Andisols of Tenerife (Canary Islands, Spain). Catena, 108, 50–57. https://doi.org/10.1016/j.catena.2012.04.011
• Nugrahanto, E. B., Suprayogi, S., Hadi, M. P., & Rahmadwiati, R. (2022). Analysis of Planned Flood Discharge Using the Nakayasu Synthetic Unit Hydrograph in Keduang Sub Watershed. Journal of Watershed Management Research, 6(2), 111-124. https://doi.org/10.20886/jppdas.2022.6.2.111-124
• Radarsolo. (2023). Water Source Discharge in Southern Wonogiri is Shrinking. Retrieved from https://radarsolo.jawapos.com/wonogiri/842816551/debit-sumber-mata-air-di-wonogiri-bagian-selatan-menyusut (in Indonesian)
• Rahayu, Supriyadi, Sumani, Herawati, A., Dewi, K. M., Mo, Y. G., & Bae, E. J. (2024). Assessment of Land Quality for Siamese Orange (Citrus nobilis var. microcarpa) Development in Pacitan Regency, Indonesia. AgriHealth: Journal of Agri-food, Nutrition and Public Health, 5(1), 29-40. http://dx.doi.org/10.20961/agrihealth.v5i1.80729
• Rekwar, R. K. (2022). Soil Organic Carbon Fractions Under Different Land Use Systems of Jorhat district. Annals of Plant and Soil Research, 24(2), 216–220. https://doi.org/10.47815/apsr.2022.10151
• Rofiq, N. F. A., Utami, S. R., & Agustina, C. (2022). Landslide Estimation Simulation: Effect of Rain Intensity on Soil with Different Texture and Organic Material Content. Jurnal Tanah Dan Sumberdaya Lahan, 9(2), 355–364. https://doi.org/10.21776/ub.jtsl.2022.009.2.16 (in Indonesian)
• Romadhon, M. R., & Aziz, A. (2022). Determination of Flood Susceptibility Index Using Overlay-Scoring Data Method based on Geographic Information System (GIS) in Semarang City, Central Java, Indonesia. AgriHealth: Journal of Agri-food, Nutrition and Public Health, 3(2), 104-123. http://dx.doi.org/10.20961/agrihealth.v3i2.60451
• Romadhon, M. R., Mujiyo, M., Cahyono, O., Maro’Ah, S., Istiqomah, N. M., & Irmawati, V. (2023). Potential Soil Degradation of Paddy Fields Through Observation Approaches from Various Sources of Environmental Diversity. IOP Conference Series: Earth and Environmental Science, 1241(1), 1-9. https://doi.org/10.1088/1755-1315/1241/1/012013
• Romadhon, M. R., Mujiyo, M., Cahyono, O., Dewi, W. S., Hardian, T., Anggita, A., Hasanah, K., Irmawati, V., & Istiqomah, N. M. (2024). Assessing the Effect of Rice Management System on Soil and Rice Quality Index in Girimarto, Wonogiri, Indonesia. Journal of Ecological Engineering, 25(2), 126-139. https://doi.org/10.12911/22998993/176772
• Schäbitz, M., Janssen, C., Wenk, H. R., Wirth, R., Schuck, B., Wetzel, H. U., Meng, X., & Dresen, G. (2018). Microstructures in Landslides in Northwest China – Implications for Creeping Displacements. Journal of Structural Geology, 106, 70–85. https://doi.org/10.1016/j.jsg.2017.11.009
• Sengupta, A., & Thangavel, M. (2023). Analysis of the Effects of Climate Change on Cotton Production in Maharashtra State of India Using Statistical Model and GIS Mapping. Caraka Tani: Journal of Sustainable Agriculture, 38(1), 152–162. https://doi.org/10.20961/carakatani.v38i1.64377
• Smith, P., Haberl, H., Popp, A., Erb, K. H., Lauk, C., Harper, R., Tubiello, F. N., De Siqueira Pinto, A., Jafari, M., Sohi, S., Masera, O., Böttcher, H., Berndes, G., Bustamante, M., Ahammad, H., Clark, H., Dong, H., Elsiddig, E. A., Mbow, C., … Rose, S. (2013). How Much Land-based Greenhouse Gas Mitigation can be Achieved without Compromising Food Security and Environmental Goals?. Global Change Biology 19(8), 2285-2302. https://doi.org/10.1111/gcb.12160
• Solopos. (2022). Handling of Sedimentation in the Keduang Wonogiri River is Considered Ineffective. Retrieved from https://soloraya.solopos.com/penanganan-sedimentasi-sungai-keduang-wonogiri-dinilai-belum-efektif-1365984 (in Indonesian)
• Stošić, M., Brozović, B., Vinković, T., Ravnjak, B., Kluz, M., & Zebec, V. (2020). Soil Resistance and Bulk Density Under Different Tillage System. Poljoprivreda, 26(1), 17–24. https://doi.org/10.18047/poljo.26.1.3
• Sun, J., & Zhou, F. (2017). Stability and Support Analysis of Coverage Rock-Soil Aggregate of Longhuguan Landslide. Polish Journal of Environmental Studies, 26(6), 2747–2758. https://doi.org/10.15244/pjoes/69436
• Supriyadi, S., Vera, I. L. P., & Purwanto, P. (2021). Soil Quality at Rice Fields with Organic, Semi-organic and Inorganic Management in Wonogiri Regency, Indonesia. Caraka Tani: Journal of Sustainable Agriculture, 36(2), 259-269. https://doi.org/10.20961/carakatani.v36i2.42556
• Suratman, Hikmatullah, & Sulaiman, A. A. (2018). Characteristics of Soils Derived from Young Volcanic Ash in West and Central Java. Jurnal Tanah Dan Iklim, 42(1), 1–12. http://epublikasi.pertanian.go.id/berkala/jti/article/view/3214 (in Indonesian)
• Surya, J. A., Nuraini, Y., & Widianto. (2017). Soil Porosity Study When Providing Several Types of Organic Materials in Robusta Coffee Plantations. Jurnal Tanah Dan Sumberdaya Lahan, 4(1), 463–471. http://jtsl.ub.ac.id (in Indonesian)
• Suryani, E., Hikmatullah, & Suratman. (2015). Mineralogical and Physico-Chemical Characteristics of Soils from Volcanic Ash in Halmahera, North Maluku, Indonesia. Jurnal Tanah Dan Iklim, 39(2), 85–98. https://epublikasi.pertanian.go.id/berkala/jti/article/download/3153/3185 (in Indonesian)
• Suyana, J., Sumarno, Supriyono, & Lestariningsih, N. P. (2017). Providing Mulch and Core Strengthening to Three Types of Plants Against Surface Runoff, Erosion, Growth and Plant Yield on Andisol Soil. Agrosains, 19(1), 15–21. https://jurnal.uns.ac.id/agrosains/article/download/20924/16276 (in Indonesian)
• Syamsiyah, J., Minardi, S., Herdiansyah, G., Cahyono, O., & Mentari, F. C. (2023). Physical Properties of Alfisols, Growth and Products of Hybrid Corn Affected by Organic and Inorganic Fertilizer. Caraka Tani: Journal of Sustainable Agriculture, 38(1), 99–112. https://doi.org/10.20961/carakatani.v38i1.65014
• Şenyer, N., Akay, H., Odabas, M. S., Dengiz, O., & Sıvarajan, S. (2023). Land Quality Index for Paddy (Oryza sativa L.) Cultivation Area Based on Deep Learning Approach using Geographical Information System and Geostatistical Techniques. Yuzuncu Yil University Journal of Agricultural Sciences, 33(1), 75-90.https://doi.org/10.29133/yyutbd.1177796
• Temgoua, E., Djoukouo, J., Likeng, J. D. H., & Tematio, P. (2019). Structural Stability of Andisols and Andic Ferralsols from Mount Bambouto, West Cameroon Highlands. Cameroon Journal of Experimental Biology, 10(1), 26. https://doi.org/10.4314/cajeb.v10i1.4
• Toprak, S., & Seferoğlu, S. (2023). Phosphorus-Enriched Organomineral Fertilizers Affect the Cation Exchange Capacity of the Soil: A Comparative Evaluation. Yuzuncu Yil University Journal of Agricultural Sciences, 33(2), 298-312. https://doi.org/10.29133/yyutbd.1265026
• Umam, K., Kusnarta, I. G. M., & Mahrup. (2022). Analysis of Dispersion Ratio and Soil Aggregate Stability in Land Use of Agroforestry Systems on Sloping Land. Journal of Soil Quality and Management, 1(1), 46–53. https://jsqm.unram.ac.id/index.php/jsqm (in Indonesian)
• Volf, M., Benites, M. V., Rosolem, A. C., Crusciol, A. C., Moraes, F. M., Menezes, F. J., & Silva, C. A. (2017). Silt as K Source for Crops in Tropical Soils. Frontiers of Potassium Science Conference, 25–27. www.ipni.nethttps://kfrontiers.org
• Wahyuti, I. S., Zulaika, I., Supriyadi, & Tonabut, W. (2023). Precise Land Evaluation Implementation of the Regional Spatial Plan in the Sleman Regency to Maintain Human Health and Food Security. AgriHealth: Journal of Agri-food, Nutrition and Public Health, 4(2), 81-92. http://dx.doi.org/10.20961/agrihealth.v4i2.67850
• Widhiyastuti, A. N., Adjie, E. M. A., Fauzan, A. A., & Supriyadi. (2023). Sustainable Food Agricultural Land Preservation at Sleman Regency, Indonesia: An Attempt to Preserve Food Security. AgriHealth: Journal of Agri-food, Nutrition and Public Health, 4(1), 41-52. http://dx.doi.org/10.20961/agrihealth.v4i1.67471
• Wuryanta, A., & Susanti, P. D. (2015). Spatial Analysis of Population Pressure on Agricultural Land in Keduang SubWatershed, Wonogiri District, Central Java. Jurnal Penelitian Sosial Dan Ekonomi Kehutanan, 12(3), 149–162. (in Indonesian)
• Xiao, H., Liu, G., Abd-Elbasit, M. A. M., Zhang, X. C., Liu, P. L., Zheng, F. L., Zhang, J. Q., & Hu, F. N. (2017). Effects of Slaking and Mechanical Breakdown on Disaggregation and Splash Erosion. European Journal of Soil Science, 68(6), 797–805. https://doi.org/10.1111/ejss.12482
• Xiao, H., Liu, G., Zhang, Q., Fenli, Z., Zhang, X., Liu, P., Zhang, J., Hu, F., & Elbasit, M. A. M. A. (2018). Quantifying Contributions of Slaking and Mechanical Breakdown of Soil Aggregates to Splash Erosion for Different Soils from the Loess plateau of China. Soil and Tillage Research, 178, 150–158. https://doi.org/10.1016/j.still.2017.12.026
• Yao, Y., Liu, J., Wang, Z., Wei, X., Zhu, H., Fu, W., & Shao, M. (2020). Responses of Soil Aggregate Stability, Erodibility and Nutrient Enrichment to Simulated Extreme Heavy Rainfall. Science of the Total Environment, 709(136150), 1-9. https://doi.org/10.1016/j.scitotenv.2019.136150
• Yatno, E., Hikmatullah, & Syakir, M. (2016). Properties and Management Implications of Soils Developed from Volcanic Ash in North Sulawesi. Jurnal Tanah Dan Iklim, 40(1), 1–10. https://epublikasi.pertanian.go.id/berkala/jti/article/view/3170
• Zhu, G., Tang, Z., Shangguan, Z., Peng, C., & Deng, L. (2019). Factors Affecting the Spatial and Temporal Variations in Soil Erodibility of China. Journal of Geophysical Research: Earth Surface, 124(3), 737–749. https://doi.org/10.1029/2018JF004918